*{
    padding: 0;
    margin: 0;
}
.layer{
    width: 800px;
    height: 200px;
    background-color: #000;
    display: flex;
    color:red;
    font-size: 100px;
    text-align: center;
    line-height: 200px;
    margin:200px auto;
}
.box{
    width: 600px;
    height:200px;
}
.btn{
    width:100px;
    height:200px;
    background-color: #000;
    color:#fff;
    font-size: 100px;
    text-align: center;
    line-height: 200px;
    border:0;
    outline: none;
}